Waterfox and Basilisk browsers are based on Firefox and will keep legacy add-on support.

There is no "please port it" or "please add support for it" this time. The entire add-on eco system changes and the technology behind this kind of add-ons gets dropped.

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This add-on restores squared tabs, the application button with application menu (known from Firefox for Windows), the add-on bar, bookmarks/history menu/sidebar buttons and other buttons. It moves star & feed buttons into location bar, adds status bar element to the ui and allows many items to be movable. All features are fully optional. Some buttons have to be moved to toolbars manually using browsers 'customizing' mode.

Main features (on CTRs preferences window)

Tab appearance: squared tabs (classic)

Tab appearance: curved tabs (all colored and visible)

Tabs not on top + [tabsontop="false/true"] attribute

Tab width and height settings

Tab title in Firefox titlebar

Tab loading animations

Tab close button on all tabs, active tab, toolbars start/end

Restore tabs empty favicon

Custom 'new tab' page url (Firefox 41+)

Double click on tabs toolbar opens 'new' tab [Windows only]

Hide tabs toolbar with one visible tab

Custom colors for tab backgrounds, text and text shadow

Custom tab separators

Application button on toolbars (+ icon variations)

Application button on titlebar [Windows only]

Custom title for application button on titlebar [Windows only]

Predefined/custom application button colors

Small navigation toolbar buttons

Movable back-forward buttons

Alternative appearance for preferences/options page

Open preferences/options page in a window (simulates preference window)

Alternative add-ons manager appearance (Firefox 40+)

Show add-ons version number inside add-ons manager (Firefox 40+)

Activity indicator (throbber) on toolbars

Bookmarks-star button in location bar

Rss-Feed button in location bar

Old Search UI (Firefox 43+)

Movable status-bar panel

Old location bar appearance (Firefox 48+)

Additional location bar

Combine stop & reload buttons

Hide location bars stop, reload & go buttons

Hide private browsing mask

Findbar on top or bottom

'Icons & Text' and 'Text only' modes

Add [iconsize="large"]/[iconsize="small"] attributes to #nav-bar node

Compact panel menus (bookmarks, history...)

Green/blue site identity button for verified websites and secure connections

Replace context menu icons with labels (Back, Forward...)

Add up to 20 additional toolbars to to top browsers area

Replace generic favicon with different icons

Favicon of a website in locations bars identity button

Different padlock icons for secure connections

AeroBlue toolbar colors for Windows 8/XP/Classic, Linux, MacOSX

Hide navigation toolbar

Inverted/white toolbar button icons

Predefined toolbar settings to alter colors, sizes, borders

Disable some of browsers default ui animations

Force some hidden toolbars to appear in fullscreen mode

Remove title/menu/tabs toolbars background color (Windows 10)

Disable browsers Loop (chat), Reader & Pocket features

...and more

Features (not on CTRs preferences window)

about:preferences keeps last selected category/tab

'Add-on Bar' (toolbar context menu)

Toggle 'Add-on Bar' using 'Ctrl + /' btw. 'Cmd + /'

'Additional Toolbar(s)' (toolbar context menu)

Spaces, Flexible spaces, Separators

Bookmarks menu & sidebar buttons

History menu & sidebar buttons

Additional movable reload & stop buttons

Movable urlbar container

Movable main menu button (three lines)

...and more

Squared tabsDefault 'curved tabs' can be optionally replaced with classic 'squared tabs'.Tabs on MacOSX look more like Windows tabs with MacOSX colors on purpose.

Curved alternative tabsAll tabs are curved and use colours known from squared tabs.

Tabs 'not' on topSimulates 'tabs.onTop=false' setting and moves tabs below navigation toolbar. On MacOSX tabs also get a 'reversed appearance'.

Application button / application menu settings

Application button on [Firefox] titlebar [Windows only]The titlebar button is fixed on titlebars left like on Firefox since version 4.0. It is enabled by default on Windows systems.

Application button on toolbarsOn toolbars the button appears like a default toolbar button.

Hide 'Navigation Toolbar'Hiding navigation toolbar might be interesting after content got moved to other toolbars.

'Add-on Bar'A toolbar at the bottom of the window. All movable buttons and items can be placed on it. Add-on bar can be enabled/disabled using toolbars context menu (right-click on a toolbar) or using 'Ctrl + /' (Windows/Linux) btw. 'Cmd + /' (MacOSX).

'Additional Toolbar'A toolbar between navigation toolbar and bookmarks toolbar. It can be enabled/disabled using toolbars context menu (right-click on a toolbar).

Bookmarks and history sidebar buttonsButtons which toggle bookmarks and history sidebar.

Back-forward, reload and stop buttonsBrowsers default buttons got merged with urlbar and cannot be moved to different toolbar positions or to different toolbars. CTR adds duplicates of these buttons to the customization palette.

Info, known 'issues', 'glitches', problems1) Application menus 'cut', 'copy' and 'paste' buttons do not always work like they should.2) Switching between AeroGlass and AeroBasic on Windows 7/Vista can change application buttons position, if the menubar is disabled. Maximizing/restoring browsers main window or restarting Firefox resolves the problem. This glitch is caused by Microsoft Windows and titlebars behavior and not by this add-on.3) Entering and leaving customizing mode 'disables' right-click menu items for bookmarks inside bookmarks menu button. A restart resolves this issue.4) Tab colors on MacOSX fit to current ui instead of using Firefox 28 colors. This is intended and not a bug.5) It is strongly recommended to remove Foxtab and Shareaholic before installing Firefox 29 or newer, because both add-ons break Firefox ui in Fx29+. Using Foxtab and/or Shareaholic with CTR causes even more errors, because CTR allows to move/remove more items than the default Firefox does.If one of these add-ons has corrupted the ui, the add-ons manager has to be accessed via menubar (right-click on a toolbar -> select menubar, Tools -> add-ons) and Shareaholic and Foxtab have to be uninstalled and CTR has to be disabled. After a browser restart, CTR can be enabled again. After another restart "restore defaults" in customizing mode has to be hit once.